A vertical straight conductor carries a current vertically upward… - Vidyadip

MCQ

A vertical straight conductor carries a current vertically upwards. $A$ point $P$ lies to the east of it at a small distance and another point $Q$ lies to the west at the same distance the magnetic field at $P$ is:

A
Greater than at $Q.$
✓
Same as at $Q.$
C
Less than at $Q.$
D
Greater or less than at $Q$ depending upon the strength of current.

✓

Answer

Correct option: B.

Same as at $Q.$

As per Biot Savart Law, Magnetic field at a point is inversely proportional to square of distance from the current carrying conductor.
Therefore magnitude of magnetic field is same at both points $P$ and $Q,$ irrespective of their position from the conductor.

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